feat(2meet-data-optimizer): backfill writes made while the Hook Bus was off

- When an entity goes from disabled to dual_write / shadow_read, or the Hook Bus flag is switched on, a single WP-Cron event (tmdo_drift_resync, one per entity, 60 s later) runs drift-check --fix for the entities that keep native meta, so values written while flat was bypassed land in flat. aeav_only is never touched.
- A full fix instead of the planned post_modified_gmt increment (decision 2026-09-27): meta-only writes such as WooCommerce's direct stock SQL do not bump post_modified. No wpdo_bridge_off_since.
- The resync hook is cleared on deactivate / uninstall (literal name: uninstall.php does not load TMDO_Drift_Check).
- Verify: DriftCheckTest resync cases (RED before); dev36 end to end with real WP-Cron: write while user disabled → miss 1 → bridge-mode user dual_write schedules tmdo_drift_resync [user] → run → drift 0.
- PR: PR-074

includes/class-tmdo-installer.php

@@ -788,6 +788,7 @@ class TMDO_Installer {
 		wp_clear_scheduled_hook( 'wpdo_health_snapshot_monthly' );
 		wp_clear_scheduled_hook( 'wpdo_post_shadow_verify' );
 		wp_clear_scheduled_hook( 'wpdo_term_comment_shadow_verify' );
+		wp_clear_scheduled_hook( 'tmdo_drift_resync' );
 		wp_clear_scheduled_hook( 'wpdo_post_stress_test_batch' );
 		wp_clear_scheduled_hook( 'wpdo_user_stress_test_batch' );
 		wp_clear_scheduled_hook( 'wpdo_term_stress_test_batch' );
@@ -991,6 +992,7 @@ class TMDO_Installer {
 			'wpdo_health_snapshot_monthly',
 			'wpdo_post_shadow_verify',
 			'wpdo_term_comment_shadow_verify',
+			'tmdo_drift_resync',
 			'wpdo_post_stress_test_batch',
 			'wpdo_user_stress_test_batch',
 			'wpdo_term_stress_test_batch',